Accumulator arrangement for the sunlight energy

ABSTRACT

A solar energy accumulator arrangement including a plurality of optical systems for focusing the sunlight and a fluid passage in a transparent body which is disposed such that it passes through, or in the vicinity of, the optical systems, the fluid passage receiving an induction substance which induces a photochemical reaction by light energy and accumulates the energy.

This application is a divisional of Ser. No. 548,427, filed Nov. 3, 1983.

FIELD OF THE INVENTION

The present invention relates to an accumulator arrangement for sunlight energy.

BACKGROUND OF THE INVENTION

Recently, attention has been paid to sunlight energy with a view to saving energy or achieving clean energy, and active research and development have been undertaken for its effective utilization in various fields.

As an example, the present applicant has already come up with various techniques whereby sunlight energy is focused through a lens etc. into a photoconductor and transmit it therethrough to a desired place where it is used as light energy for the purpose of illumination or other purpose.

In the art, the technique has also been introduced, whereby the light is permitted to strike upon an induction substance to induce a photochemical reaction in that material and thereby accumulate the resulting light energy, and the thus accumulated energy is thereafter recovered as heat energy with the use of a catalyst (for instance, see Japanese Patent Publication No. 57-124657), and those skilled in the art have had increasing interest in that technique. It is thus feasible to use sunlight energy as heat energy, if the sunlight energy is accumulated in the induction substance.

However, when it is desired to accumulate solar energy in the induction substance, there is a fear that the photochemical reaction may not take place over the induction substance, since the intensity of the sunlight varies depending upon weather and time. This is particularly true of the case where the sunlight energy is feeble. As a result, the amount of energy to be accumulated in the induction material is so reduced that a uniform and efficient build-up of energy may be unfeasible.

SUMMARY OF THE INVENTION

It is therefore a first object of the present invention to provide a solar energy accumulator arrangement in which the solar energy can uniformly and efficiently be accumulated in an induction substance as mentioned above.

Another object of the present invention is to provide an accumulator arrangement for sunlight energy designed to make efficient use of the sunlight energy by an effective combination of a technique whereby the sunlight is used as light energy as well as heat energy.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 to 4 inclusive are sectional views showing part of the embodiment wherein the sunlight energy is accumulated heat energy within an induction substance.

FIGS. 5 to 12 are views illustrative of the embodiment of the accumulator arrangement for sunlight energy wherein the technique whereby the sunlight energy is used as light energy is combined with that whereby the sunlight energy is used as heat energy within an induction substance, FIG. 5 being a sectional view showing part of that embodiment, FIG. 6 being a plan view as viewed in the direction of the line A--A of FIG. 5, FIG. 7 being a view showing one embodiment of the photoconductor disposed at a certain position, FIGS. 8 to 11 being sectional views illustrative of the embodiment of the present invention, and FIG. 12 being a plan view of FIG. 11.

DETAILED EXPLANATION OF THE INVENTION

Referring to FIG. 1 showing part in section of the embodiment of the present invention, a lens 1 is provided for focusing the sunlight L. A transparent passage 2 for fluid is arranged on or in the vicinity of the focal point of the lens 1. Within the passage 2 there is an induction substance 3 capable of absorbing light energy to induce a photochemical reaction for the accumulation of energy, said material being adapted toflow in the direction indicated by an arrow. The lens 1 is controlled by known means (not illustrated) in such a manner that it directs automatically to the sun. The sunlight L focused through the lens 1 strikes upon the induction substance 3 received within the fluid passage 2 disposed on or in the vicinity of the focal point of the lens 1, and induces a photochemical reaction within the material 3, whereby the induction substance is converted into its isomer having a high energy level for the accumulation of energy. The induction substance in which the energy has been built up flows in the direction indicated by an arrow for recovery. Thereafter, when a catalyst is applied to the recovered induction substance, for example, at night, it returns to the original state while emitting heat which can then be used as heat energy. It is noted that the induction substance, which is now restored to the original state, can be re-used for the accumulation of energy. In the present invention, the sunlight is converged to increase its intensity, and allowed to strike upon the induction substance. Therefore, even when the incoming sunlight is feeble as experience in cloudy weather or at dawn or dusk, it is possible to feed sufficient light energy to the induction substance, so that a photochemical reaction can effectively be induced in the induction substance. When the sunlight energy is feeble, the flow rate of the induction substance may be decreased, while when the sunlight energy is at a higher level, the flow rate of the induction substance may be increased. In this manner, even when the sunlight energy is feeble, it is possible to induce a uniform photochemical reaction over the induction substance. When the sunlight energy is at a lighter level, it is possible to induce a photochemical reaction in a large amount of the induction substance, so that uniform and effective accumulation of the sunlight energy is achieved.

FIG. 2 is a longitudinal section of part of another embodiment of the present invention. As illustrated, the fluid passage 2 through which the induction substance 3 flows is provided on its outer wall with a solar cell 4, by which the sunlight energy can be used as electric energy. In such an arrangement, the light component having a short wavelength is absorbed in the induction substance, and does not reach the solar cell. It is unlikely that such a light component may be built up as heat energy and the efficiency solar cell may drop for that reason while FIG. 2 illustrates the arrangement in which the solar cell 4 is disposed on the underside of the fluid passage, i.e., downstream of the optical path system for the sunlight focused through the lens 1, it may be disposed in an area outside of the vicinity of the focal point of the lens 1, as indicated by a phantom line in the figure, if a drop in the efficiency of the solar cell due to the accumulation of heat energy is insignificant.

FIG. 3 is a longitudinal section of part of a further embodiment of the present invention. As illustrated, the fluid passage 2 through the induction substance flows is provided on its inner wall with a black body 5. In this arrangement, the heat energy of the sun entering the fluid passage 2 is effectively transmitted to the induction substance 3 to increase its temperature. Thus, when the induction substance is recovered, the heat energy carried by the induction substance can be used.

FIG. 4 is a longitudinal section of part of a still further embodiment of the present invention. As illustrated, the fluid passage is provided on its outer wall with the solar cell 4 and on its inner wall with the black body 5, whereby the sunlight energy can be used as either heat energy or electric energy.

While the present invention has been described with reference to several embodiments, the present invention is not limited thereto. For instance, when the present invention is applied within the atmosphere containing less ultraviolet rays, a sensitizer may be added to the induction substance, which converts the light component having a wavelength of less than about 360 mm into the light component having a wavelength of about 500 mm, whereby a photochemical reaction can more effectively be induced in the induction substance. When the flow rate of the induction substance is controlled depending upon the intensity of the sunlight, a light detecting cell 6 is disposed on a line extending from the focus of the lens 1 and on the outer surface of the underside of the fluid passage 2, as shown in FIGS. 1 to 4. The flow rate of the induction substance is controlled by the output signal of the cell 6, so that the light acting upon the induction substance is directly detected, thereby more effectively controlling the flow rate of the induction substance.

The embodiments in which the sunlight energy is accumulated in the induction substance have been described. In what follows, explanation will be made to several embodiments wherein the aforesaid accumulator arrangement for the sunlight energy is effectively combined with the sunlight collector arrangement already proposed by the present applicant.

To make the most effective use of sunlight energy, it has to be applied as light energy without converting it into another form of energy such as light or electric energy. From this point-of-view, the present applicant has made various proposals about sunlight collectors in which the sunlight energy is focused through a lens or the like into a photoconductor, through which it is transmitted to a place where illumination is needed. In the following embodiments, the sunlight collector as mentioned above is effectively incorporated into the aforesaid arrangement for the conversion of the sunlight energy into heat energy, whereby the light and heat energies of the sunlight can simultaneously be utilized in a single unit.

FIG. 5 is a longitudinal section illustrating part of a still further embodiment of the present invention, and FIG. 6 a view as viewed from the direction of the line A--A of FIG. 5. In these figures, 1 is a lens for focusing the sunlight L, 7 a photoconductor having its light receiving end 7a disposed in the vicinity of the focal position of the lens 1, and 2 a fluid passage formed of a transparent body and disposed in the rear of the light receiving end 7a of the photoconductor 7. Within the fluid passage 2, there is an induction substance 3 to absorb light energy, cause a photochemical reaction and accumulate the energy, which flows, for instance, in the direction indicated by an arrow. In this embodiment, the lens 1 is controlled such that it directs automatically to the sun by means of a suitable device (not shown). The sunlight L focused through the lens 1 is introduced into the photoconductor 7 having its light receiving end 7a located at the focal point of the lens 1, through which it is transmitted to any desired place for the illumination or other purpose. A part of the sunlight which is not admitted into the photoconductor 7 strikes upon the induction substance 3 flowing through transparent fluid passage 2, giving rise to a photochemical reaction which converts the induction substance into its isomer for the accumulation of the energy. The induction substance which accumulates the energy flows in the direction indicated by an arrow for recovery. Thereafter, when a catalyst is applied, for instance, at night, it returns to its original state while giving off heat which can then be used as heat energy.

The induction substance which is now restored to the original state can be reused in the foregoing manner for the accumulation of energy. As mentioned above, the present invention makes it possible to introduce the sunlight focussed through a lens or the like into a photoconductor, through which it is transmitted to any desired place for the illumination or other purpose. In addition, a part of the sunlight which is not used for illumination can effectively be used to accumulate the energy in the induction substance, which is thereafter used as heat energy. According to the present invention the sunlight can effectively used. If the light receiving end 7a of the photoconductor 7 is located in the rear of the focal point P of ultraviolet rays, as illustrated in FIG. 7, the visible light is admitted into the photoconductor 7 without introducing thereinto the light component having a short wavelength, such as ultraviolet rays, and reaches the rear induction substance. In this manner, the sunlight can more effectively be used. It is noted that the induction substance reacts photochemically with the light component having a wavelength of no more than about 400 nm.

FIG. 8 is a longitudinal section showing part of a still further embodiment of the present invention. In this embodiment, the fluid passage 2 formed of a transparent body, through which the induction substance 3 flows, is provided on its inner wall with the black body 5 as illustrated, by which the sunlight energy entering the fluid passage 2 is effectively transmitted to the induction substance 3 to increase its temperature. In the recovery of the induction substance, the heat energy carried by said induction substance can be used.

FIG. 9 is a longitudinal section showing part of a still further embodiment of the present invention, As illustrated, the fluid passage 2 formed of a transparent body, through which the induction substance 3 flows, is provided on its underside with the solar cell 4, upon which the light transmitted through the induction substance 3 acts effectively. According to this embodiment, the sunlight can also be used as electric energy. With such an arrangement, the light component having a short wavelength is absorbed without reaching the sollar cell. It is thus unlikely that such a light component may be accumulated as heat energy in the solar cell, and the efficiency of the solar cell may drop for that reason. As will easily be appreciated from FIG. 10, the black body 5 of FIG. 8 may be used in combination with the solar cell 4 of FIG. 9.

While the present invention has been described with reference to its specific embodiments, it is not limited thereto. For instance, if the flow rate of the induction substance is controlled in response to a detection signal resulting from the detection of the intensity of the sunlight, the energy is then more effectively accumulated in the induction substance. When the present invention is applied within the atmosphere containing less ultraviolet rays, a sensitizer may be mixed with the induction substance. The light component having a wavelength of no more than about 360 nm is converted by said sensitizer into a light component having a wavelength of about 500 nm, with the result that a photochemical reaction is more effectively induced in the induction substance.

FIG. 11 is a longitudinal section showing part of a still further embodiment of the present invention, and FIG. 12 is a plan view of FIG. 11. This embodiment is effectively applied to sunlight in outer space which contains large amounts of X-rays, shortwave ultraviolet rays such as vacuum ultraviolet rays and medium or long wave ultraviolet rays. The sensitizer required in the foregoing embodiments is dispensed with, since the sensitizer may be destroyed by intensive ultraviolet rays. The more characteristic feature of this embodiment is that intensive ultraviolet rays, etc. are absorbed in the induction substance without introducing thereinto light components having such a short wavelength, so that only visible light of good quality and safety is admitted into the induction substance. Since the fluid passage 2 of a transparent body is disposed in front of the lens 1 in this embodiment, there is no need for the provision of any opening for the insertion of the photoconductor through the fluid passage. Hence, the fluid passage of a simple structure is easily be assembled at low cost. 

What is claimed is:
 1. A solar energy accumulator arrangement comprising an optical system for focussing the sunlight and a photoconductor having its light receiving end disposed at the focal point of said optical system, said sunlight being focussed through said optical system and transmitted through said photoconductor to any desired place, and further including a transparent conduit defining a fluid passage through which said photoconductor passes, an induction substance flowing through said fluid passage at a flow rate responsive to the intensity of said sunlight, said induction substance being capable of transformation to a higher energy level by a photochemical reaction to thereby accumulate solar energy from the light component thereof, whereby, when the energy level of said induction substance returns to its original state, said energy is emitted as heat.
 2. The arrangement as recited in claim 1, in which a solar cell is disposed on the outer surface of said fluid passage downstream of the optical path of said optical system.
 3. The arrangement as recited in claim 1, in which a black body is disposed on the inner surface of said fluid passage downstream of said optical system.
 4. The arrangement as recited in claim 1, in which said induction substance contains a sensitizer.
 5. The arrangement as recited in claim 1, in which a light detecting cell is disposed on the outer surface of the underside of said fluid passage, said cell producing an output signal in response to which the flow rate of said induction substance is controlled.
 6. The arrangement as recited in claim 1 further comprising means for controlling the flow rate of said induction substance responsive to the intensity of said sunlight. 